Method of truing valve forgings and the like



April Z2, 1930. w. S/POETZINGER 1,755,663

METHOD OF TRUING'VALVE FQRGINGS AND THE LIKE Filed March 21, 1927 Mn 5 MM w W 2 W M0 mm attorney l atented Apr. 22, 1930 WILLIAM s. FIPOETZINGER, or LANSING, MICHIGAN, ASSIGNOR TO 3E0 MOTOR CAR COMPANY, OF LANSIII NG, MICHIGAN, A COBPOBA'IION OF MICHIGAN METHOD OF TRUI NG VALVE'FORGINGS AND THE LIKE Application filed March 21 1927. Serial- No; 177,174.

This invention relates to the method. of truing valve forgings and the like and has among its objects to provide a simple, expedient,economical and commercially satisfactory'method of this character.

In the manufacture .of valves such as I poppet valves and the like, which are customarily drop-forged, itis found that the head of the valve is frequently distorted and disposed non-uniformly with respect to the "stem of the valve. 'Carem'ust be taken in correcting this lack of uniformity or irregularity of the valve headbecause otherwise when the valve islater put in use and subjected, for instance, to the heat of an internal combustion engine the parts tend to resume their previous disaligned positions with the result that the valve-fails to function properly. r

It is therefore, the primary object of this invention to provide means for truing up such types of valves and to operate upon the valves while the same is in a highly heated condition and in such a'manner that the head is Referring now part1 ings wherein like reference'characters indi- 'cate like parts, it will be noted that in Figure 2 I have illustrated a valve of the poppet valve type which includesa stem 10 and a head 11. Valves of this character are usually commercially produced by drop-forging the same and frequently, owing toany one of a number of difierent reasons, the head ll of the valve is found'tobe. slightly angularly disposed on out of its-true plane with reference to the stem 10 or inother words tobe 'discularly to the draw gested by dotted line 12 in 'FigureQ. Obviously it. is necessary that the valve head be straightened or trued up and disposed in uniform relationwith respect to the stem 10 and for accomplishing this-I provide the following mechanism. e

The stem 10 of the valve is engaged in a rotary chuckl and rotated in apredetermined and fixed plane about the longitudinal axis of the valve. During this rotation the head 11' is engaged by a truing element .14 upon a shaft 15 carried by asupport 16. The truing element 14 is arranged in a predetermined fixed relation withreference to the axis of rotation of the valve and as illustrated in the drawings is arranged at an angle with reference to the longitudinal axis posed with reference to the stem 10 as sug- I of the valve. vDuring the rotation of the valve,the valve head will be engagedby the truingelement to thus exert a pressure tend-V ing to right the valve head and dispose the same in a uniformplane which intersects at right angles a plane passing through the axis of the valve stem. In this manner any irregularities or angularities of the valve head are corrected andthe head disposed in a true and uniform relation with reference to the stem. V I It should be understood that'the step. of

truing the valve is performed while the valve "forgings are hot and in practice the valves are taken directly from the forge to the truing up machine thus eliminating the necessity of re h'eating the forgings'. It is obvious, however, that in some instances it may be desirable or expedient tore-heat the forgings before the truing up operation. 1

It should furthermore be understood that thejstem 10 of the'valve is gripped throughout the greater portion of its length by the jaws ofthe chuck 131so that any possibility of thesame becoming distorted or unbalanced longitudinally is eliminated. i 7

While one type of apparatus is herein il lustrated and described as suitable for carrying. into execution the method herein described and claimed, it will be readily apparentto thosefskilled in this art that other forms apparatus may be employed with equal facility and to this end reservation is operative to apply sufficient pressure to dismade to make such changes in the details of place portions of the head and arrange the the construction illustrated as may come same in uniform relation to the stem.

within the purview of the accompanying claims.

What I claim as my invention is:

1. The method of truing valve forgings 1 which consists in rotating the valve while hot in" a predetermined fixed plane and engaging the head with a truing element arranged in fixed relation to the axis of rotation of the valve, to displace by pressure certain portions of the head to dispose the same uniformly with respect to the stem of the valve. 7 V

' 21 The methodof truing valve forgings which consists in rotating the valve about a predetermined and fixed axis, and engaging the head with a template operative to v dispose by pressure certain portions of the head in uniform and predetermined relation to the stem.

" 3; The method of truing valve forgings which consists in rotating the valve about a predetermined and fixed axis, and engaging the head with a template arranged at an angle to'the'axis of the valve and operative to bendnon-uniform portions of'the head in uniform and predetermined relation to the stem. i V

4. The" method of truing valve forgings which consists in. rotating the valve about the axis of its stem and applying pressure to the head by means of a truing roller arranged at an angle to the axis of rotation of the valve to bend the same into a uniform relation to the stem.

5'. The method of truing valve forgings which consists in rotating the valve about the axis of its 7 stem and subjecting the head 7 of the valve to'pressure tending to bend and square the same relative to the axis of the stem; 7'

a 6. The method of truing valve forgings which consists in rotating the valve about the axis'of its stem, and applyingpressure to the head of the valve by means'of a truing rolleftenclingto bend and dispose the head in a plane which intersects at right angles a plane passing through the axis of the valve stem.

'7. The method of truing valve forgings which consists in gripping the stem of the valve throughout the greater portion of its length, rotating it about the axis of the stem, andengaging the head of the valve with a template arranged at an angle to the axis of,

VILLIAM S. POETZINGER. 

